Backdoor Roth Conversion

I will turn 73 in 2026. I have approximately $128,000 in a Traditional IRA with $129,500 in non-deductible contributions that I will fully convert to a Roth IRA before the end of 2025. I’m retired and have not made an IRA contribution in the last 3 years. I have no other IRA accounts. Both the Traditional IRA and the Roth IRA are with the same brokerage. How do I report this on my 2025 Federal tax return using TurboTax?